Potassium pyrophosphate refers to the potassium salt of pyrophosphate. The representative phosphate among poly (poly) phosphate fertilizers. It is a group of phosphorus-containing compounds usually produced by the reaction of pyrophosphoric acid and potassium hydroxide. The main use of potassium pyrophosphate is to replace potassium cyanide for cyanide-free electroplating. With the development of national industrial modernization, the demand for potassium pyrophosphate is increasing day by day. It is also used in industry for surface treatment, high-end detergents, paints and coatings, detergents, dispersants, buffers, etc.; in the food industry, it is used as emulsifier, texture improver, chelating agent, quality improver, etc. Potassium pyrophosphate can also be prepared from dipotassium hydrogen phosphate.
Properties
White powder. It is hygroscopic in the air. Relative density 2.534. Melting point 1109℃. It loses two molecules of crystal water at 180°C and loses all crystal water at 300°C. Its properties are similar to those of sodium pyrophosphate, but its solubility is larger. Soluble in water, insoluble in ethanol. Aqueous solutions are alkaline. The solubility in 100g of water at 25oC is 187g. The pH of an aqueous solution with a concentration of 1% is 10.2.
Purpose
1 Potassium pyrophosphate is mainly used for cyanide-free electroplating, replacing sodium cyanide as the complexing agent for electroplating. Also used as pre-treatment agent for electroplating and pyrophosphate plating solution. Preparation of detergent components for clothing, metal surface cleaners and bottle detergent components, and additives for various detergents. Used as a clay dispersant in the ceramic industry, a dispersant and buffer for pigments and dyes. In the bleaching and dyeing industry, it is used to remove a small amount of ferric ions in water to improve the quality of bleaching and dyeing. Potassium pyrophosphate is also an excellent stabilizer for hydrogen peroxide.
2. Used as emulsifier, texture improver, chelating agent in the food industry, and also used as raw material of alkaline water for flour products. Often used in combination with other condensed phosphates, it is usually used to prevent the formation of struvite in canned aquatic products and prevent the discoloration of canned fruits; improve the expansion of ice cream, the yield of ham and sausages, and the water holding capacity of ground fish; improve the taste and yield of noodles. rate, preventing cheese from aging, etc.
3. Potassium pyrophosphate can also be used as a complexing agent for alkaline electroless nickel plating and in the preparation of detergents. Pyrophosphate can also be used as a complexing agent for alkaline nickel plating.
Reference quality standards
Electroplating grade potassium pyrophosphate implementation standard: HG/T 3591-1999
| Indicator name | Unit | Electroplating grade |
| Potassium pyrophosphate (K4P2O7) Content | ≥% | 98.0 |
| Iron (Fe) content | ≤% | 0.01 |
| Water-insoluble matter content | ≤% | 0.10 |
| PH value (10g/L aqueous solution) | – | 10.5±0.5 |
| Lead (Pb) content | ≤% | 0.003 |
| Hull cell test (plating at Dk≥10 A/dm2) | Qualified |
Industrial potassium pyrophosphate implementation standard: ZB/TG 12006-88
| Indicator name | Unit | Premium product | First class product | Qualified product |
| Potassium pyrophosphate (K4P2O7) content | ≥% | 96.0 | 95.0 | 94.0 |
| Iron (Fe) content | ≤% | 0.03 | 0.05 | 0.10 |
| Water-insoluble matter content | ≤% | 0.10 | 0.20 | 0.25 |
| PH value (1% aqueous solution) | – | 10.0-10.7 | ||
| Orthophosphate | Meets test | |||
Packing: 25Kg in plastic bag with inner plastic and outer woven bag or according to customer requirements.
Storage and transportation: Store in a dry and clean warehouse. Pay attention to moisture and rain. It should be stored separately from flammable or combustible materials and acids. Pay attention to personal protection during packaging and transportation operations. When transporting, load and unload gently to prevent damage to the packaging. It is not suitable to transport on rainy days.
